Any suggestions of people/company to insulate a bay window?

http://cdn.brownstoner.com/50b2c968a10ea-.jpg

After last winter it was painfully obvious that the contractor for the building I bought a condo in did not adequately (if at all) insulate the bay window in my bedroom.  I’m looking for someone to insulate underneath the floor, the walls & underneath the roof — does anyone have suggestions of who to call that will do a good job?